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Most of the industry operators and service companies have developed and implemented a directional drilling collision avoidance rules based on strict controls to prevent well collisions and subsequent human and environmental damage. These rules are formulated based on best practices and mitigation procedures across the industry experience. However, these rules are sometimes found to be severely restricted to the optimal wellbore positioning of wells representing mainly the safe drilling to prevent surface or deep collision risks with offset wells. Historically ADMA-OPCO and ZADCO were adapting the basic collision avoidance rules from its shareholders policy and mainly depends on service companies' internal policy to rely on execution phase which was creating huge well spacing among drilled wells resulting in extreme narrow path for future well placement which was affecting field development severely. The need for a comprehensive collision avoidance practice and policy was eminent when the world- class ERD project with artificial Islands as drill centers was commenced in 2013, which instigated the process for developing a Wellbore positioning and collision avoidance policy for ADNOC offshore concessions operated by ADMA and ZADCO. In general the collision avoidance procedure should define on how to maximize the safety by avoiding or managing the collision with critical offset wells during the planning and execution phases of the drilling program. The scope of this document includes, but is not limited to, a set of anti-collision policies including standards, practices and guidelines to manage the master database structure and integrity, position uncertainty, surface location, survey program, collision avoidance procedure, wellbore survey operation, quality assurance, data integration and communication protocols to the interested parties, etc. Developed policies helped the drilling team to standardize the technical and operational consistency for safe planning, supervision and execution of directional drilling operation activities greatly. Outlining the roles and responsibilities of the well collision avoidance and wellbore positioning procedures eased the operation greatly in an offshore Artificial Island drill center environment with 100s of ERD wells being planned to be drilled. The brief technical details of verity survey technologies and surveys management advancements are covered in the guidelines to get an general education on subject matter to the end user which will help them to identify and finalize the survey program to drill the well safely. The detailed collision risk matrix and risk mitigation procedure guidelines has helped the drilling engineers to conduct the required risk assessment and mitigation plans in place during planning phase itself and supervise it during execution with enough control measures in place. The roles and responsibilities of each service companies involved is categorically mentioned in the policy allowing all parties to implement their contribution without failure.
Most of the industry operators and service companies have developed and implemented a directional drilling collision avoidance rules based on strict controls to prevent well collisions and subsequent human and environmental damage. These rules are formulated based on best practices and mitigation procedures across the industry experience. However, these rules are sometimes found to be severely restricted to the optimal wellbore positioning of wells representing mainly the safe drilling to prevent surface or deep collision risks with offset wells. Historically ADMA-OPCO and ZADCO were adapting the basic collision avoidance rules from its shareholders policy and mainly depends on service companies' internal policy to rely on execution phase which was creating huge well spacing among drilled wells resulting in extreme narrow path for future well placement which was affecting field development severely. The need for a comprehensive collision avoidance practice and policy was eminent when the world- class ERD project with artificial Islands as drill centers was commenced in 2013, which instigated the process for developing a Wellbore positioning and collision avoidance policy for ADNOC offshore concessions operated by ADMA and ZADCO. In general the collision avoidance procedure should define on how to maximize the safety by avoiding or managing the collision with critical offset wells during the planning and execution phases of the drilling program. The scope of this document includes, but is not limited to, a set of anti-collision policies including standards, practices and guidelines to manage the master database structure and integrity, position uncertainty, surface location, survey program, collision avoidance procedure, wellbore survey operation, quality assurance, data integration and communication protocols to the interested parties, etc. Developed policies helped the drilling team to standardize the technical and operational consistency for safe planning, supervision and execution of directional drilling operation activities greatly. Outlining the roles and responsibilities of the well collision avoidance and wellbore positioning procedures eased the operation greatly in an offshore Artificial Island drill center environment with 100s of ERD wells being planned to be drilled. The brief technical details of verity survey technologies and surveys management advancements are covered in the guidelines to get an general education on subject matter to the end user which will help them to identify and finalize the survey program to drill the well safely. The detailed collision risk matrix and risk mitigation procedure guidelines has helped the drilling engineers to conduct the required risk assessment and mitigation plans in place during planning phase itself and supervise it during execution with enough control measures in place. The roles and responsibilities of each service companies involved is categorically mentioned in the policy allowing all parties to implement their contribution without failure.
A survey program is designed for every well drilled to meet the well objective of penetrating the target reservoir and to avoid colliding with other offset wells. The selection of the wellbore survey tools within the survey program are limited to the current accuracy available to the industry. A newly developed wellbore survey technique has proven to have superior accuracy compared to the current standard measurement-while-drilling (MWD) surveys with in-field referencing and multi-station analysis (MSA). In almost every drilling bottom hole assembly (BHA), there is an MWD survey tool to survey the wellbore while drilling. Accuracy of the MWD surveys has been improved over the years by correcting potential error sources such as misalignment of the survey package from the borehole, drillstring magnetic interference, limited global geomagnetic reference, and gravity model accuracy. This new positioning technique takes the accuracy of MWD surveys to the next level by combining surveys from two independent survey packages. The second survey package is installed inside the rotary steerable system (RSS). Surveys from both packages are retrieved while drilling. Results have been obtained from multiple runs worldwide, enabling comparisons between the new technique and standard MWD surveys from both an enhanced accuracy and true wellbore placement point of view. A proposed error model is based on both the theoretical improvements in accuracy and the empirical proof from the data analyzed. The improved accuracy while drilling assures higher confidence that the well placement will maximize reservoir production and avoid collision with nearby offset wells. In reservoir sections, the wellbore survey accuracy limits the lateral spacing, and this constrains the reservoir production. In top and intermediate sections, wellbore survey accuracy limits the well plan, and this affects how close the well can be drilled in proximity to other offset wells. This directly impacts the complexity of the directional work and the cost per drilled foot. The new technique unlocks the potential to significantly improve the wellbore positioning accuracy.
With the launch of a mega drilling project in the Middle East, the drilling data during the execution stage was collected in two formats; Low-Frequency Data and High-Frequency Data. This paper explains the effective utilization of data in the performance enhancement scheme. The paper also demonstrates the combination of Low-frequency and High-frequency data can reveal the many secrets of the drilling operations and can open the many sides of drilling operations for improvements. Low-Frequency data was entered manually at the rig-site using an improved coding system to identify the activities start and end times. High-Frequency data was collected through real-time transmission from the different data streaming services at the rig-site. Both data forms were collected simultaneously using stringent rules and close follow-ups to make sure that data collection was free of any reporting mistakes and gaps. Later, the collected data was extracted for different types of analyses and interpretations. Low-frequency data was studied in a novel way to get the best analytical and critical outcome to make sure that the right areas for improvements were identified and actions were implemented for enhanced performance. Improved operations coding system helped the team to categorize the operations and failures in an effective way to set new standards in data analysis. More than 100 different types of analyses using the best data analysis technique, such as trailing average, normalization, trends, etc., were conducted based on the information collected during the execution phase, and many new KPIs were established with challenging milestones to be achieved in the prescribed period. High-Frequency data was split into different sets of KPIs to identify the multiple Invisible Lost Time (ILT) areas to boost the operational efficiency. Various performance enhancement schemes were developed based on High-frequency data. As a result, these schemes were proven to enhance the performance of the mega drilling project. This paper discusses the novel methods of drilling data analysis based on low and high-frequency data and shows the effectiveness of the data presented in a standardized format over a period. It deliberates how the teams were challenged to enhance the performance. Such detailed data analysis will bring valuable information for the industry to utilize the conventional database in modernized ways to get the best outcomes from the data analysis results.
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